Journal
MATERIALS & DESIGN
Volume 30, Issue 10, Pages 4146-4155Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2009.04.033
Keywords
Laser; Welding; High strength steels; Hardness; Tensile strength
Categories
Funding
- Ford Motor Company
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Advanced high strength steels (AHSS) are essential to meet the demands of safety and fuel efficiency in vehicles. In this paper, we present the results of laser welding of two AHSS steels,TRIP780 and DP980. A 2 kW Trumpf TRUDISK 6002 (R) Yb:YAG laser beam was utilized to join 1 mm thick TRIP780 with 1.5 mm thick DP980 and 1 mm thick mild steel. Optical metallography was used to characterize the weld profile and microstructures. Microhardness, tensile and fatigue tests were performed to evaluate the mechanical properties. Results indicate that the laser welds exhibit excellent strength and hardness with minimal defects which are attributed to the high beam quality, disk type of laser. In addition, there is a distinct effect of pre-straining of TRIP780 steels on the energy absorption. (C) 2009 Elsevier Ltd. All rights reserved.
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